Cup-making machine



Feb. 14, 1950 F. RUZA 2,497,239

CUP-MAKING MACHINE Filed March 22, 1944 2 Sheets-Sheet 1 IN V EN TOR.

- Feb. 14, 1950 F. RUZA CUP-MAKING MACHINE 2 Sheets-Sheet 2 Filed March 22, 1944 INVENTOR.

Wade/lack Ragga, BY

Patented Feb. 14, 1950 UNITED STATES PATENT OFFICE :i-tti I 2,497,239 I i I I CUP-MAKING Frederick Ruza, Chicago, 111., assignor, by mesne assignments, to Paper,Container Manufacturing 00., Chicago, 111., a corporation of Illinois Application March 22, 1944, Serial No. 527,609

. 3 Claims. (01. 9,336.2)

- The present inventionrelates to improvements in'cup-making machines. More particularly, it pertains to the manufacture of paper cups in which an adhesively treated web of paper is cut, rolled, and then pressed and finished by means of a novel die carriage device having pressing and finishing dies and related mechanism for operating the same, such as the type disclosed in-the Merta Patent No. 2,321,407, and over which the present device is an improvement.

In that type of machine, the pressing and finishing diescarried in the die carriage lacked the necessary relative resiliency positively to accommodate the different layers of paper comprising the cup, such as the many thicknesses in the convolutely wound apex as compared with the single overlap in the cup body. Consequently, improperly formed and leaky cup bottoms often resulted. In addition to this, the lack of relative resiliency between the parts permitted the accumulation of glue and other foreign matter which further tended to aggravate the condition.

A large part of the leakage was obtained in round-v ing the bottom on the cup due to the impact of the forming element at this point. While the rounded cup bottoms seemed to be perfect, it was found that many leaked during use. To over-' come this disadvantage, forming rollers having a flanged extension thereon were utilized in connection with the mandrels for aiding in rounding the bottoms of the cups as they were formed and these elements played an important part in the structure of such machines.

Generally, therefore, it is an object of the present invention to overcome the foregoing disad vantages by the provision of a die carriage having relatively resilient dies and with related parts re-.

duced in number, such as those herein described which are positive and efficient in operation and which will function relatively free from mechanical as well as other difficulties and disadvantages.

Primarily, it is an object of the invention toprovide a die carriage having a body pressing die to press together an adhesively treated overlap of a cup, and means, resiliently mounted in the carriage and yieldable with respect to the die, to press together adhesively treated layers at the apex of the cup independent of the time of operation of the body pressing die. I

More specifically, it is an object of the present invention to provide a reciprocating die carriage for a conical cup-making machine that has means for winding a blank into cup form on a conical mandrel having. a frusto-conical 2 I body pressing die with a cylindrical extension to press together the adhesively treated overlap of a cup, an apex forming die resiliently mounted within the cylindrical extension to press together convolutely wound adhesively treated layers at the apex of the cup in advance of-the body pressing die, and a cup bottom blunting member carried by the apex forming die operated by a hammer member carried by an extension connected to the cylindrical portion, whereby the blunting of the bottom of the cup is obtained after the overlap and convolutely wound layers have been pressed together. 1

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the feae tures of construction, combination of elements, and arrangement of parts, which will be exem-, plified in the construction hereinafter set'forth and the scope-of the application of which will be indicated in the claims. a

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description, taken in connection with the accompanying drawing, in

which: 1

Fig. 1 is a plan view, partly in section and with parts broken away, of a die carriage illustrating a preferred embodiment of the invention;

Fig. 2 is a side elevational view in section, on a somewhat smaller scale;

Fig. 3 is an end elevational view of riage; and

Fig. 4 is a side elevational riage on a reduced scale, with parts broken away,

the die carand illustrating the driving means therefor.

Referring more particularly to the drawings, there is indicated generally at In a reciprocating die carriage slidably mounted on suitable shafts- This carriage comprises a housing II carrying therein a frusto-conical body pressing die I2 and. a mechanism, indicated generallyat I3, for press-. ing the convolutely wound layers at the apex ofa cup as well as for blunting thebottom thereof. This mechanism consists of a resiliently mount-- ed apex forming die I4, mounted within a cylin-i drical extension I5 of the frusto-conical body end ll of the cylindrical extension I5 and, by a yoke I8 (each of which carries parts about described) in the other direction. v Carried within the central opening. of the apex forming die I4 is acup apex tip blunting pin lg view ofthe die at,

to be.

This pin is suitably rounded as at 2|] to give the proper formation to the cup bottom during the blunting operation, as will more fully appear hereinafter. It should be understood at this point that, if desired, the apex of a cup need not be blunted during the formation of the bottom and, in that event, the blunting pin may be properly counterbored.toaccommodatethe point of a-,cup withoutperinitting any distortion thereof." The blunting pin has an enlarged portion 21 and an annular flange 22. Around the enlarged portion, which is seated against the shoulder lfirofi. the apex forming die I4, is a spring 23 which normally urges the pin 19 outward-1y sothat it-is' re siliently and slidably mounted inrthe' opening in" the head of the apex forming diein which it" is carried.

Carried in the yoke l8, in a suitable bearing 24, is a loosely and slidably mounted compensating pin 25. This pin also has an annular flange extension 26 which isadapted to beseated against the--portion'22ofthe blunting pin 2!.- This pin 25 functions as a hammeraszwill more fully appear hereinafter. Actually, thezpin 25 during operation is-permitted'to float, that is, to move freely along itsaxis'toward-andaway from the flange 22 of the pin 21. This distance of movement of the -pi-n 2l is" approximately regulated at about one-quarter of .aninch or more.

Attached to the carriage H is another bracket or yoke-21 which straddlesthe pin 25; In this yoke-21 is an'adjusting-scre-w 28, the end of which controls the distance through w-hich the pin 25'is permitted 'freeplay'.

The cupwinding'mandrel is indicated" at 29, the-cuprim'forming'porti'on at 30, the=-cupbead forming'portion at 3|; and the mechanism for driving the bead forming elements are. indicated generally at 32; These need no further descrip+v tion sincethey are generally similar in structure and in operation to those disclosed in the abovementioned Merta patent.

Theentire carriage, including 'the rim forming mechanism 30; is reciprocal-ted bya very simple crank=link 33 attached to a wristipin 34.? suitably secured to the die carriage as indicated general.-

ly at 35; Thelink 33: is 'eccentrically connected to :a crank-SB, as indicatedtat 3.];

Operation In operation the foregoing describedelements function as follows: The crank '36 transmits its power through the link 33 and the carriage is constantly reciprocated; The'mandrel 29-carryingacup 38; having an adhesively treated single overlap 3,9, and an apex consisting of convolutely wcundoverl'apping portions MI, enters'the dies 12, and Hto be pressed. That is, the action of the crank 36 reciprocates' the entire die; carriagethrough the link 33* so that both body pressing die-I2 and apex pressing die l3 repeatedly'completely cover and uncover" the mandrel after ablank has been Wound in cup formation thereon; At this-point the adhesive'is still in a tacky con-- dition and'it'isdesirable by the present operation' securely-to bond the adhesivelytreatedparts apeirforming 'die 14, because itextends-into the bodyforming die, is the first to engage the apex of the cup and press the convolutely wound portions in position. Since it proceeds in advance of the body forming mechanism, this operation is the first to be completed.

Substantially simultaneously thereafter the body forming mechanism beginsthe pressing of the single overlap and advances to a point at the completionthereof where the apex forming die and the body forming die are in internal surface alignment, as shown in the solid line positions of Fig l, as well as in Fig. 2.

Substantially immediately at this point the blunting' pin- 21 is struck by the hammer pin 25 and urgediag ainst the pressure of the spring 23. As thejlatter' is'forced into this position by being contactedv bythe-I end of the set screw 28, the rounded portion 20 of the blunting pin l9 blunts or'rounds off the bottom of the cup to complete the entire bottom forming operation of setting the cup in this area; This delayedaction can best be seen as illustrated by the dotted line position 42" of the last described elements and these positions also indicate the approximate d-istance-through-w-hich the compensating pin- 25 is permitted tofloat along its longitudinal 'a-xis'. The various-parts ofthe die carriage are-there after again restored to their normal'position-by means'of' various springs; such as those illus-' trated at 23, 43 and; as'the entire'carriage is reciprocated in the opposite direction by-means of the crank link 33 and crank 36 and' into posi-- tion where the various operations can again be repeated. Thesprings- 43 and-44 are-mounted on bolt-like members which function as guideor slide bars while-holding the springs'w-hich'ab sorb the thrust of thesbody pressingdie- I2 immediately'after the. blunting operation is--=performed 'onthe cup tip.

It will thus be seen thattheobjects herein-- before set forth may readily and eillciently be obtained; and since certain changes -maybe made in the above constructionand different embodi-- mentsofthe invention could be made without departing from the scope thereof; it'is intended that all matter contained in theabove descrip tion', or shown in the accompanying drawings; should be interpreted asillustrative andnotina limitingsense.

It -'-is also to 'beunderstood thatthe following claims are intended to coverall of the generic and specific featuresof the-inventionherein described, and all statements'ofthe scope of'theinvention which; as a matter-of language, might be said to fall therebetween.

Havingdescribed my invention, what I claim as newa-nddesiretosecure by Letters Patent- 15 1. Inaconical cup-makingmachine provided with means-for windinga blank into cup form on 60 aiconical mandrel; the improvementcomprising the combinationofadie carriage having abody; pressing die to press together an adhesively treated overlap ofjsaid cup, and means, resiliently mounted in saidcarriage and yieldablewith respect to said die, to press together convolutely wound adhesively treated layers at the apexof said cup, said means including a bottom-setting mechanism" to set 'the bottom of said'cup after: said overlap and convolutely wound layers have been pressed together.

2." Ina conical cup-mak-in machine provided with means for winding a blank into cup form'on a conical mandrel, the" improvement comprising;

the combinationofa die carriage having 'a'body pressing dieto press together an adhesively treated overlap of said cup, and means, resiliently mountedf-{in said carriage and yieldable with respect to said 'die, to press together convolutely wound adhesively treated layers at the apex of said cup in advance of said body pressing die, said means including a bottom setting mechanism to set the bottom of the cup after said overlap and convolutely wound layers have been pressed together, said mechanism including a cup bottom blunting element and a hammer element to operate said blunting element.

3. In aconical cup-making machine provided with means for winding a blank into cup form on a conical mandrel, the improvement comprising a reciprocating die carriage having a frustoconical body pressing die to press together an adhesively treated overlap of said cup, said die having a cylindrical extension thereon, an apex forming die resiliently mounted within said extension to press together convolutely wound adhesively treated layers at the apex of said cup REFERENCES CITED fIhe following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1220,51! Kondolf Mar. 2'? 1917 2,104,535 Barbieri Jan. 4, 1938 2,197,782 Barbieri Apr. 23, 1940 2,220,312 Barbieri Nov. 5, 1940 21321307 Merta June 8, 1943 

